While one would assume that the tennis pro floated onto set, did her thing next to Bey, and then went out to dominate on the court, that wasn’t exactly the case. She told WSJ, “I got really sore from dancing!” At least we know now whom to confide in if we ever needed a secret kept. Williams swears, “If you tell me, ‘Don’t say anything,’ I won’t say anything.” Exactly the kind of friend that the queen of the surprise album-drop needs.